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3D optical data storage — is the term given to any form of optical data storage in which information can be recorded and/or read with three dimensional resolution (as opposed to the two dimensional resolution afforded, for example, by CD). [ Three Dimensional Optical Data … Wikipedia
Photochromism — is the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation, where the two forms have different absorption spectra. [ [http://pubs.acs.org/journals/chreay/thematic/00/photo.html Chemical … Wikipedia
Molecular switch — A molecular switch is a molecule that can be reversibly shifted between two or more stable states.[1] The molecules may be shifted between the states in response to changes in e.g. pH, light, temperature, an electrical current, microenvironment,… … Wikipedia
HIRSHBERG, YEHUDAH — (1905–1962), Israeli physical chemist. Hirshberg, who was born in Poland, went to Palestine in 1923 to join a kibbutz. In 1933 he joined the Daniel Sieff Institute (later part of the Weizmann Institute) at Reḥovot. Hirshberg worked on the… … Encyclopedia of Judaism

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